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Published online 8 October 2007
Published in Vadose Zone J 6:735-745 (2007)
DOI: 10.2136/vzj2006.0139
© 2007 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Dual-Permeability Models for Chemical Leaching Assessment to Assist Pesticide Regulation in Hawaii

G. Alavia, J. Dusekb, T. Vogelb, R. E. Greenc and C. Raya,*

a Dep. of Civil & Environmental Engineering and Water Resources Research Center, Univ. of Hawaii at Manoa, Honolulu, HI 96822
b Faculty of Civil Engineering, Czech Technical Univ., Prague, Czech Republic
c Natural Resources and Environmental Management, Univ. of Hawaii at Manoa, Honolulu, HI 96822

Figure 1
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  		FIG. 1. Daily pan evaporation, irrigation, and precipitation (i.e., rainfall) during the 1989 experiment on Molokai soil at the Kunia site, Oahu, HI.

 

Figure 2
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  		FIG. 2. Simulated (S1D DUAL) water percolation from 3-m soil profile.

 

Figure 3
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  		FIG. 3. MACRO-simulated outflow from the soil profile at 1 m depth during a large episodic storm that occurred in March 2006.

 

Figure 4
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  		FIG. 4. Measured (mean values and standard deviations, squares and bars) and simulated (MACRO, dashed lines; S1D DUAL, solid lines) soil water contents at different depths during the experiment period (summer 1989). All values are a composite of water content in the matrix and macropore domains.

 

Figure 5
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  		FIG. 5. Measured (mean values and standard deviations) and simulated bromide profiles in the Molokai soil at four times after bromide application.

 

Figure 6
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  		FIG. 6. Measured (mean values and standard deviations) and simulated atrazine profiles in the Molokai soil at four times after atrazine application.

 

Figure 7
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  		FIG. 7. Measured (mean values and standard deviations) and simulated hexazinone profiles in the Molokai soil at four times after hexazinone application.

 

Figure 8
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  		FIG. 8. Relative mobilities of five pesticides in Molokai soil as indicated by the Tier I AFR index, dynamic MACRO model, and field data. DBCP, dibromochloropropane.

 




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